Swift：可以喝多少啤酒？

最近，亲人给我出了一道题：

啤酒

• 2元1瓶
• 4个瓶盖换1瓶
• 2个空瓶换1瓶

问:

• 10元可以喝几瓶

防止老年痴呆

作为习惯了和机器打交道的狮，还是让机器告诉我答案吧：

var bottle = 0
var cap = 0
var numberBeer = 0

var surplusCap = 0
var surplusBottle = 0

func numberOfBottle(cap:Int, emptyBottle:Int) -> Int {
    
    bottle = bottle + cap/4 + emptyBottle/2
    surplusCap = cap%4
    surplusBottle = emptyBottle%2
    
    numberOfCapAndBottle(cap/4 + emptyBottle/2)
    
    return bottle
}

func numberOfCapAndBottle(beer:Int) {
    
    surplusCap += beer
    surplusBottle += beer
}

func numberOfBeer(beerNumber: Int) -> Int {
    
    bottle = beerNumber
    surplusCap = beerNumber
    surplusBottle = beerNumber
    
    while surplusBottle >= 2 || surplusCap >= 4 {
        
        numberBeer = numberOfBottle(surplusCap, emptyBottle: surplusBottle)
    }
    return numberBeer
}
// 10元首先可以买5瓶
numberOfBeer(5)  // 15
print(surplusCap) // 3
print(surplusBottle) // 1

你算对了吗？